Blair pointed out to the Canadian public broadcaster, CBC, that throughout the country there are 880 police officers who have been trained to detect drivers under the influence of marijuana.
The agents will have devices to find tetrahydrocannabinol or THC, the psychoactive ingredient of cannabis, in saliva.
The consequences for the road safety of drivers under the influence of marijuana have been one of the main concerns of the legalization of cannabis in Canada by organizations that fight to reduce the number of accidents on the road.
Blair argued today that the police have faced for years drugged drivers and that, until now, "they had never had the ability to detect it" due to the lack of equipment equivalent to breathalyzers that detect alcohol in the breath.
He added that the Government has provided 161 million Canadian dollars (124 million US dollars) to the police forces for training and purchase of equipment, before the imminent legalization of marijuana.
The Canadian Prime Minister, Justin Trudeau, won the elections of October 2015 at the head of the Liberal Party with a program that included the legalization of the recreational use of marijuana.
The plan establishes that the production and distribution of marijuana will be strictly regulated by the Ministry of Health and the Canadian provinces.
On October 17, Canada will become the first G7 country to fully legalize marijuana use.
